Urinary Fistula After Kidney Transplant — Repair
This operative overview covers drainage, selection of reconstruction and reported outcomes. See Urinary Fistula After Kidney Transplant for causes, presentation and diagnostic evaluation. Management requires the transplant team, urology and interventional radiology; colorectal or other reconstructive expertise may be needed for complex diversion.
Stabilization and Selection of Treatment
An early, low-volume leak may heal with urinary drainage. A massive leak, extensive nonviable ureter or failure of drainage requires prompt surgical assessment. Conservative treatment is not a compulsory waiting period before every repair. EAU 2026 bases management on leak location, timing and volume, with JJ stenting and bladder catheterization and/or nephrostomy; it recommends surgery when conservative management fails.[18]
- Assess hemodynamics, graft function, urine output, infection and existing drains. Treat suspected sepsis promptly, obtain cultures when feasible and drain infected or clinically significant collections. Not every small contained collection requires a separate drain.[2][4]
- Ensure effective bladder drainage and decompress the graft when indicated. Catheter size and the choice of retrograde stent, antegrade stent or nephrostomy depend on anatomy and drainage; a universal ≥18 Fr Foley or mandatory nephrostomy before every operation is unsupported.[18]
- Drain-fluid creatinine supports suspicion of a urine leak in context; localize the source and associated obstruction with appropriate imaging. A ratio just above serum creatinine is not an independently validated universal confirmation rule.[18]
- Define viable transplant ureter, defect length, recipient ureter suitability and bladder capacity/compliance. Protect graft vessels during re-exploration. Avoid an anastomosis under tension or through necrotic tissue.[2]
Immunosuppression
Do not automatically reduce mycophenolate or corticosteroids, or stop an mTOR inhibitor, for every urinary fistula. The transplant team should individualize changes for infection severity, wound problems, drug toxicity, time from transplantation and rejection risk. A retrospective 300-recipient study associated infection-related reduction at 2–6 months with more rejection; it does not establish a fistula-specific drug-reduction protocol or prove causation.[4][17]
Percutaneous and Endoscopic Management
Nephrostomy can decompress the graft, define the leak and provide antegrade access. A stent may bridge a suitable defect, while bladder drainage reduces downstream pressure. Reassess output, infection, graft function and imaging; persistent leakage or nonviable tissue should trigger reconsideration of reconstruction rather than indefinite catheter treatment.[2][18]
| Primary series | What was actually reported | Interpretation |
|---|---|---|
| Matalon, 1990 | Leak closure in 20/23 patients after percutaneous diversion; mean diversion 68 days | Historical selected cohort, not a prescribed duration for every leak; later stricture and systemic illness remained concerns[6] |
| Alcaraz, 2005 | 10/16 patients selected for endourological treatment healed; 13 other patients underwent open repair | Contrast reached the bladder in 13, of whom 10 healed; none of three without passage healed. These small groups do not validate a universal predictive rule or a 72-hour treatment cutoff[7] |
| Nie, 2009 | Stent plus Foley drainage for 1–2 weeks succeeded in 8/43 fistula patients | Most patients in this series needed reconstruction; the result belongs to this study, not Bhagat's predominantly stricture cohort[1] |
Historical nephrostomy denominator caution: Goldstein's 1981 survey found 98 repair failures among 317 mixed leak/obstruction complications. Of those failures, 85 occurred without nephrostomy and 13 with it. The often-quoted 87% and 13% are the distribution of failures, not the respective treatment-group failure rates. They cannot support a claim that nephrostomy reduces an individual's failure risk from 87% to 13%.[5]
An 8 Fr Foley used for ureteral intubation was reported in five selected infected fistulas unsuitable for primary repair, with four successes. This is a small salvage experience, not a standard alternative catheter protocol. Bladder-catheter-only treatment is more plausible for selected vesical leaks than ischemic ureteral defects, but the same series does not establish universal 42% versus 0% probabilities.[3]
Choosing Reconstruction
These are anatomy-dependent options, not a mandatory sequence. Drainage or staged source control may be appropriate in an unstable patient, but uncontrolled infection or devitalized tissue may itself require urgent surgery.[2][5]
| Reconstruction | Main anatomical requirement or limitation |
|---|---|
| Repeat ureteroneocystostomy | Sufficient viable transplant ureter reaches a usable bladder without tension after removal of nonviable tissue |
| Native ureteroureterostomy / pyeloureterostomy | A suitable recipient ureter provides drainage to the bladder when donor ureter is insufficient |
| Boari flap ± psoas hitch | A well-vascularized, adequately capacious and mobile bladder can bridge a longer defect |
| Direct pyelovesicostomy | Transplant renal pelvis and bladder can meet without tension; bladder pressure and reflux consequences matter |
| Pyelopyelostomy | Rare salvage using an accessible native renal pelvis and suitable downstream drainage |
| Bowel-based diversion | Selected patients whose native lower tract or other reconstruction is unsuitable |
The first four options are supported by transplant reconstruction experience; no universal percentage table establishes one as superior for all active leaks.[2][9][11][14]
Repeat implantation and native ureter reconstruction
Preserve blood supply, excise nonviable ureter and construct a tension-free anastomosis with postoperative drainage tailored to the repair. Comparative results for primary transplant implantation techniques and success rates from nontransplant traumatic injuries should not be presented as salvage-fistula repair rates.[2]
Schult's 48 secondary pyeloureterostomies included 29 stenoses, 17 necroses and two other indications. Forty had normal postoperative graft function; one graft was removed for complete pyelonecrosis, two were lost to acute rejection and five lacked late data. This is not a 48-patient urinary-fistula-only cohort.[9]
When using a native ureter, consider residual native renal function, infection and previous ureteral surgery. In a 495-patient cohort combining primary and secondary pyeloureterostomy, 10 required subsequent ipsilateral native nephrectomy after ureteral ligation. Caution was emphasized for ADPKD and neurogenic augmented bladders; this aggregate risk is not specific to leak repair.[10]
Minimally invasive reconstruction is feasible in selected recipients, but Yang's seven-patient experience involved four strictures and three cases of reflux with graft pyelonephritis, not seven active fistulas. Its absence of postoperative obstruction or leak does not establish comparative safety for infected acute repairs.[8]
See Ureteroureterostomy.
Bladder flap and direct pyelovesicostomy
A Boari flap bridges a defect using bladder tissue; direct pyelovesicostomy joins the graft pelvis to the bladder when reach permits. Neither should expose the graft to an untreated hostile high-pressure reservoir.[2]
Del Pizzo's 20 reconstructions included nine complete ureteral necroses and 11 long or multisegment strictures: 15 Boari flaps and five direct pyelovesicostomies. All were successful at mean 28-month follow-up, but reflux occurred in six, and prolonged stenting/drain output was not uncommon after Boari reconstruction. This selected experience is not a guaranteed 100% outcome.[11]
Later Boari reports chiefly concern stricture salvage. Boonjindasup treated 14 of 16 late-stricture patients with a Boari flap and reported one flap failure; the abstract's 6.3% is inconsistent with its stated 1/14 denominator. Kroczak reported no recurrent stricture in ten refractory cases at mean 18 months. These small nonrandomized studies do not prove that Boari is superior first-line treatment for an acute transplant leak.[12][13]
See Boari Flap & Psoas Hitch and Pyelovesicostomy.
Rare salvage and adjuncts
- Pyelopyelostomy: Wagner's six-patient series included three necroses, two long strictures and one iatrogenic lesion. Four were alive with functioning grafts at median six-year follow-up; it was not six cases of total ureteral necrosis.[14]
- Omental interposition: vascularized coverage can support a difficult recurrent repair. Ye reported no recurrence in 13 selected patients over 1–7 years, without a control group. This does not prove a mandatory adjunct or independent prevention of recurrence.[15] See Omental Flap.
- Ileal conduit or other diversion: selection depends on usable bladder, ureters and bowel. Graft survival after transplantation into a conduit is a different outcome from closure of an active fistula. Negative-pressure wound therapy has been described for selected complex conduit-associated fistula wounds, alongside control of urinary leakage and infection; it is not a substitute for urinary drainage.[2][16]
- Transplant nephrectomy: may be necessary for an unsalvageable graft or uncontrolled graft-related infection when reconstruction cannot provide safe drainage. The decision weighs recipient survival and realistic graft salvage.[1][9]
Follow-Up
Confirm adequate drainage and healing before removing supporting tubes, with imaging selected for the repair. Continue transplant follow-up for graft function, infection and subsequent obstruction; successful closure does not exclude a later stricture. Duration of Foley, stent and nephrostomy support should follow clinical and imaging findings rather than an old series' average.[6][11]
References
1. Nie ZL, Zhang KQ, Li QS, et al. "Treatment of Urinary Fistula After Kidney Transplantation." Transplant Proc. 2009;41(5):1624–6. doi:10.1016/j.transproceed.2008.10.103
2. Novacescu D, Abol-Enein H, Latcu S, et al. "Ureteric Complications and Urinary Tract Reconstruction Techniques in Renal Transplantation: A Surgical Essay." J Clin Med. 2025;14(12):4129. doi:10.3390/jcm14124129
3. Suaid HJ, Cassini MF, Tucci S, et al. "Therapeutic Option for Infected Urinary Tract Fistulas in Renal Transplantation." Transplant Proc. 2010;42(2):479–82. doi:10.1016/j.transproceed.2010.01.029
4. Yamanaka K, Kakuta Y, Nakazawa S, et al. "Surgical and Infectious Complications Following Kidney Transplantation: A Contemporary Review." J Clin Med. 2025;14(10):3307. doi:10.3390/jcm14103307
5. Goldstein I, Cho SI, Olsson CA. "Nephrostomy Drainage for Renal Transplant Complications." J Urol. 1981;126(2):159–63. doi:10.1016/s0022-5347(17)54426-2
6. Matalon TA, Thompson MJ, Patel SK, et al. "Percutaneous Treatment of Urine Leaks in Renal Transplantation Patients." Radiology. 1990;174(3 Pt 2):1049–51. doi:10.1148/radiology.174.3.174-3-1049
7. Alcaraz A, Bujons A, Pascual X, et al. "Percutaneous Management of Transplant Ureteral Fistulae Is Feasible in Selected Cases." Transplant Proc. 2005;37(5):2111–4. doi:10.1016/j.transproceed.2005.03.118
8. Yang KK, Moinzadeh A, Sorcini A. "Minimally-Invasive Ureteral Reconstruction for Ureteral Complications of Kidney Transplants." Urology. 2019;126:227–231. doi:10.1016/j.urology.2019.01.002
9. Schult M, Küster J, Kliem V, et al. "Native Pyeloureterostomy After Kidney Transplantation: Experience in 48 Cases." Transpl Int. 2000;13(5):340–3. doi:10.1007/s001470050711
10. Neto HM, Tedesco Silva Junior H, Pestana JM, Foresto RD, Aguiar WF. "Urological Complications Associated With Pyeloureterostomy Without Ipsilateral Nephrectomy in Renal Transplant Recipients." Transpl Int. 2021;35:10213. doi:10.3389/ti.2021.10213
11. del Pizzo JJ, Jacobs SC, Bartlett ST, Sklar GN. "The Use of Bladder for Total Transplant Ureteral Reconstruction." J Urol. 1998;159(3):750–2; discussion 752–3. doi:10.1016/S0022-5347(01)63719-4
12. Boonjindasup A, Smith A, Paramesh A, et al. "A Rationale to Use Bladder Boari Flap Reconstruction for Late Kidney Transplant Ureteral Strictures." Urology. 2016;89:144–9. doi:10.1016/j.urology.2015.10.028
13. Kroczak T, Koulack J, McGregor T. "Management of Complicated Ureteric Strictures After Renal Transplantation: Case Series of Pyelovesicostomy With Boari Flap." Transplant Proc. 2015;47(6):1850–3. doi:10.1016/j.transproceed.2015.02.020
14. Wagner M, Dieckmann KP, Klän R, Fielder U, Offermann G. "Rescue of Renal Transplants With Distal Ureteral Complications by Pyelo-Pyelostomy." J Urol. 1994;151(3):578–81. doi:10.1016/s0022-5347(17)35019-x
15. Ye J, Li Q, Liu R, et al. "Pedicled Greater Omentum Graft: A New Technique to Repair Recurrent Urinary Fistulae After Kidney Transplantation." Cell Biochem Biophys. 2012;62(1):69–72. doi:10.1007/s12013-011-9260-y
16. Heap S, Mehra S, Tavakoli A, et al. "Negative Pressure Wound Therapy Used to Heal Complex Urinary Fistula Wounds Following Renal Transplantation Into an Ileal Conduit." Am J Transplant. 2010;10(10):2370–3. doi:10.1111/j.1600-6143.2010.03237.x
17. Yang B, Ye Q, Huang C, Ding X. "Impact of Infection-Related Immunosuppressant Reduction on Kidney Transplant Outcomes: A Retrospective Study." Transpl Int. 2023;36:11802. doi:10.3389/ti.2023.11802
18. European Association of Urology. EAU Guidelines on Renal Transplantation. 2026. Sections 3.1.7.h–i: urinary leak and ureteral stenosis. Guideline.